High speed drilling attachment



- March 11, 1958 B. F. DIRZIUS ETAL HIGH SPEED DRILLING ATTACHMENT FiledDec.

EN T0 United States Patent HIGH SPEED DRILLING ATTACHMENT Bennie F.Dirzius and Robert H. Mayfield, Cicero, UL; said Mayfield assignor tosaid Dirzins Application December 1, 1954, Serial No. 472,365

1 Claim. (Cl. 74-606) Our invention relates to an attachment forincreasing the speed of a conventional drill press.

Among the objects of our invention is to provide an attachment adaptedto be removably attached to a conventional drill press or drillingmachine, whereby the speed of the drill may be multiplied to permit fineand precision drilling of small holes in a minimum of time, labor andexpense.

The ordinary drill press is not capable of a sufliciently high R. P. M.to efliciently drill small holes in certain metals and materials. Drillpresses made to have a sufiiciently high R. P. M. for high speed workare very expensive. It is among the objects of our invention to providean attachment for the ordinary drill press, so that its R. P. M. may bemultiplied many times for such high speed work. Our attachment therebyconverts an ordinary drill press into a high speed drill pressimmediately and inexpensively.

Another object is to provide a simple and uncomplicated structure,lasting in wear, successful and economical in operation, operable byanyone without special training, portable and effective in results.

Our invention contemplates such other objects, advantages andcapabilities as will later more fully appear and which are inherentlypossessed by our invention.

While we have shown in the accompanying drawings preferred forms of ourinvention, yet we wish it understood that the same are susceptible ofmodification and change without departing from the spirit of ourinvention.

Referring to the drawings, Fig. 1 is a side elevational view of ourattachment attached to a drill press; Fig. 2 is a top plan view of ourhigh speed drilling attachment; Fig. 3 is a side elevational view of thesame; Fig. 4 is an enlarged disassembled sectional view of our device;Fig. 5 is an assembled sectional view of the same; Fig. 6 is a detailedview partly in section on line 66 of Fig. 4; Fig. 7 is a detailed viewpartly in section on line 7-7 of Fig. 4; and Fig. 8 is a detailed viewpartly in section on line 8-8 of Fig. 5.

The embodiment selected to illustrate our invention comprises a drivingspindle or shaft 10, the upper end of which is adapted for removableengagement with the chuck 11 of a conventional drill press 12. At thelower end of shaft is a bottom rounded flange 13, to the under surfaceof which are rotatably attached a pair of spaced planetary gears 14 and15 by pins 16. Said planetary gears engage a larger stationary internalgear 17 positioned within housing 18 by pin 19 or any other suitableattaching means. Said planetary gears also engage pinion gear 20 whichis mounted on central chuck shaft 21. A bushing 33 is mounted within thecentral bottom portion of housing 18 at bottom opening 23 and throughwhich extends chuck shaft 21. To chuck shaft "ice 21 is attached a chuck22 adapted to removably receive .a drill 24.

A torque arm 25 has one end attached by screw threads or other suitablemeans to housing 18 and in operation of the device bears against column26 of the conventional drill press 12 to which our device is attached.

To removably close the open end of housing 18, we provide a cap 27adapted to be attached thereto by screw threads or other suitable means.Said cap 27 has a raised central portion 28 with an opening 29 thereinwithin which is mounted bushing 80. The upper end of driving shaft 10extends through opening 29. A pair of spaced screw threaded openings 30and 34 are provided in cap 27 to receive set screws 32, which extend tointernal gear 17 for locking the same in position.

Driving shaft 10 has a hollowed out portion 33 within which ispositioned bushing 31, and into which rotates the upper portion of unitchuck shaft 21. A steel end thrust ball 35 is positioned in a recess 36in the upper portion of chuck shaft 21 and rotates against an end thrustbutton 84 supported by the upper end of bushing 31.

An annular oil seal 85 is fitted within recess 36 in housing 18 toprevent loss of lubricant.

The ordinary drill press is too slow to efficiently drill small holes incertain materials. Our attachment may be attached to such a drill pressby inserting the upper driving shaft into the chuck of the press. As thepress rotates shaft 10, planetary gears 14 and 15 travel on large gear17 and move pinion gear 20. In the embodiment shown in the drawingsherein, the pinion gear 20 moves four times the speed of driving shaft10. Pinion gear 20 correspondingly drives unit chuck shaft 21 with chuck22 and attached drill 24 at such increased R. P. M. The result is thatthe drill 24 is enabled to move rapidly enough for efficiently drillingsmall holes.

In actual tests our device has resulted in a speed of 21,000 R. P. M.and is capable of much greater speed. Such speed is ample for theefiicient drilling of small holes.

Having thus described our invention, we claim:

The combination of a gear casing, a gear in said gear casing, said gearconstituting one gear element of a train or set of gears, said casingproviding a seat for said gear, means for securing said gearnon-rotatably in said seat, a cover for said gear casing, said cover andsaid casing having coacting screw threads, a plurality of threadedapertures through said cover, a like plurality of screws threadedlyengaged in said apertures and having one end bearing against one sideface of said gear, said screws coacting with said cover and gear tomaintain said gear in seated position and to prevent relative threadwisemovement of said cover and casing.

\ References Cited in the file of this patent UNITED STATES PATENTS638,643 Newman et al. Dec. 5, 1899 721,930 Zellers Mar. 3, 19031,721,612 Yannes July 23, 1929 2,368,133 Galamb Jan. 30, 1945 2,420,040Frisby et al. May 6, 1947 2,590,649 Gregoire Mar. 25, 1952 FOREIGNPATENTS 349,272 Great Britain May 28, 1931 409,430 Italy Feb. 15, 1945

